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Originally Posted by Gary H
I use a set of 18's for road and 17's for track - mainly because the difference in price between a set of 17's and 18 Toyo R888's is huge!
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When a friend and I were looking at building a new class car for SCCA, 17" had an unlimited supply of race and ultra high performance tires in any width or series (30, 40, etc). Also varying different series tires will allow you to make minor OA gear rate changes and rake changes to the chassis.